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Deep holes are defined by a ratio between the hole depth and the hole diameter.
Deep hole ratio depths are more than 10x the diameter and up to 150x the diameter ratio.
There are 3 types of deep drilling methods:
STS (Single tube system)
DTS (Double tube system)


High Table Feeds

ISCAR Single Flute Gundrill

Deep Hole Drilling Index

Deep Drills for Milling Centers and Lathe Machines

TRIDEEP Gundrills and
Deep Drilling Heads